An underwater camera is a specialized waterproof imaging device used in hydrographic surveys to visually observe and record conditions beneath the water surface. It complements acoustic survey equipment such as echo sounders by providing real-time images and video of the seabed, underwater structures, and submerged objects.

These cameras are widely used for seabed verification, inspection of ports and harbour structures, post-dredging assessment, and identification of underwater obstructions. By offering direct visual confirmation, underwater cameras enhance the accuracy, safety, and reliability of hydrographic survey operations